HydroBASINS lev08 watershed · #2080022000
Bassin de la Seulles
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 1 administrative regions : Calvados
Sub-basin area
695,3km²
Upstream area
695,3km²
Discharge
3,84m³/s
Mean elev.
64m
Administrative coverage
144 communes (GADM L5)Available for FRA, RWA
- Cahagnes21.75 km²87% commune
- Anctoville17.61 km²96% commune
- Grandcamp-Maisy14.66 km²100% commune
- Cheux13.75 km²95% commune
- Lingèvres12.51 km²87% commune
- Audrieu11.86 km²100% commune
- Villy-Bocage11.38 km²97% commune
- Rots10.95 km²92% commune
- Douvres-la-Délivrande10.93 km²100% commune
- Fontenay-le-Pesnel10.52 km²100% commune
- Géfosse-Fontenay10.27 km²89% commune
- Ryes10.07 km²100% commune
- Ver-sur-Mer9.06 km²100% commune
- Creully8.82 km²100% commune
- Cricqueville-en-Bessin8.68 km²100% commune
- Tilly-sur-Seulles8.61 km²100% commune
- Saint-Manvieu-Norrey8.53 km²99% commune
- Thaon8.52 km²100% commune
- Courseulles-sur-Mer8.52 km²100% commune
- Hottot-les-Bagues8.11 km²97% commune
- Englesqueville-la-Percée8.06 km²100% commune
- Hermanville-sur-Mer7.93 km²99% commune
- Colleville-Montgomery7.74 km²97% commune
- Meuvaines7.69 km²100% commune
- Bernières-sur-Mer7.49 km²100% commune
- Monts-en-Bessin7.20 km²100% commune
- Saint-Georges-d'Aunay7.19 km²30% commune
- Le Fresne-Camilly7.17 km²100% commune
- Saint-Gabriel-Brécy7.08 km²100% commune
- Cully6.95 km²100% commune
- Bretteville-l'Orgueilleuse6.91 km²100% commune
- Jurques6.90 km²54% commune
- Nonant6.88 km²100% commune
- Graye-sur-Mer6.83 km²100% commune
- Secqueville-en-Bessin6.76 km²100% commune
- Bény-sur-Mer6.68 km²100% commune
- Vaux-sur-Seulles6.58 km²100% commune
- Livry6.54 km²28% commune
- Le Manoir6.14 km²100% commune
- Port-en-Bessin-Huppain6.09 km²76% commune
- Cairon6.08 km²100% commune
- Vierville-sur-Mer5.98 km²99% commune
- Amblie5.97 km²100% commune
- Fontaine-Henry5.70 km²100% commune
- Colleville-sur-Mer5.63 km²85% commune
- Amayé-sur-Seulles5.58 km²100% commune
- Crépon5.53 km²100% commune
- Ouistreham5.42 km²55% commune
- Tessel5.25 km²98% commune
- Sainte-Croix-Grand-Tonne5.25 km²100% commune
- Tracy-Bocage5.10 km²100% commune
- Saint-Pierre-du-Mont5.02 km²100% commune
- Bucéels4.98 km²100% commune
- Maisoncelles-Pelvey4.86 km²94% commune
- Asnières-en-Bessin4.86 km²100% commune
- Lion-sur-Mer4.84 km²100% commune
- Langrune-sur-Mer4.76 km²100% commune
- Sainte-Honorine-des-Pertes4.69 km²80% commune
- Banville4.68 km²100% commune
- Noyers-Bocage4.66 km²50% commune
- Coulvain4.60 km²100% commune
- La Cambe4.47 km²38% commune
- Saint-Louet-sur-Seulles4.47 km²100% commune
- Reviers4.45 km²100% commune
- Louvières4.38 km²100% commune
- Juaye-Mondaye4.36 km²27% commune
- Lantheuil4.36 km²100% commune
- Carcagny4.30 km²100% commune
- Coulombs4.27 km²100% commune
- Saint-Côme-de-Fresné4.24 km²100% commune
- Vienne-en-Bessin4.19 km²100% commune
- Basly4.07 km²100% commune
- Lasson4.06 km²100% commune
- Bazenville4.03 km²100% commune
- Saint-Germain-d'Ectot4.02 km²82% commune
- Saint-Laurent-sur-Mer3.96 km²93% commune
- Sommervieu3.82 km²91% commune
- Tracy-sur-Mer3.81 km²100% commune
- Villers-Bocage3.81 km²66% commune
- Cresserons3.81 km²100% commune
- Saint-Vaast-sur-Seulles3.80 km²100% commune
- Commes3.78 km²57% commune
- Cristot3.75 km²100% commune
- Brouay3.75 km²100% commune
- Vendes3.73 km²100% commune
- Martragny3.67 km²100% commune
- Luc-sur-Mer3.65 km²100% commune
- Rosel3.62 km²100% commune
- Juvigny-sur-Seulles3.54 km²100% commune
- Putot-en-Bessin3.49 km²100% commune
- Ducy-Sainte-Marguerite3.43 km²100% commune
- Deux-Jumeaux3.41 km²91% commune
- Saint-Pierre-du-Fresne3.38 km²100% commune
- Authie3.37 km²98% commune
- Longues-sur-Mer3.26 km²26% commune
- Le Mesnil-Patry3.20 km²100% commune
- Loucelles3.18 km²100% commune
- Chouain3.15 km²100% commune
- Colombiers-sur-Seulles3.15 km²100% commune
- Saint-Aubin-sur-Mer3.07 km²100% commune
- Esquay-sur-Seulles3.05 km²100% commune
- Magny-en-Bessin3.00 km²67% commune
- Manvieux2.84 km²100% commune
- Tierceville2.83 km²100% commune
- Rucqueville2.71 km²100% commune
- Anguerny2.65 km²91% commune
- Saint-Contest2.57 km²31% commune
- Colomby-sur-Thaon2.54 km²99% commune
- Condé-sur-Seulles2.41 km²100% commune
- Asnelles2.39 km²100% commune
- Villiers-le-Sec2.39 km²100% commune
- Formigny2.26 km²20% commune
- Sainte-Croix-sur-Mer2.14 km²100% commune
- Saint-Martin-des-Entrées1.99 km²33% commune
- Villons-les-Buissons1.70 km²49% commune
- Saint-Aubin-d'Arquenay1.37 km²44% commune
- Mathieu1.24 km²13% commune
- Arromanches-les-Bains1.19 km²100% commune
- Plumetot1.04 km²100% commune
- Saint-Martin-des-Besaces1.00 km²4% commune
- Longueville0.95 km²14% commune
- Carpiquet0.88 km²15% commune
- Cardonville0.86 km²23% commune
- Ellon0.83 km²13% commune
- Caumont-l'Éventé0.80 km²13% commune
- Saint-Jean-des-Essartiers0.77 km²9% commune
- Anisy0.77 km²19% commune
- Les Loges0.72 km²16% commune
- Saint-Vigor-le-Grand0.44 km²4% commune
- Écrammeville0.39 km²6% commune
- Saint-Germain-la-Blanche-Herbe0.39 km²16% commune
- Brémoy0.28 km²2% commune
- Aignerville0.13 km²3% commune
- Verson0.11 km²1% commune
- Grainville-sur-Odon0.09 km²2% commune
- Longraye0.08 km²1% commune
- Tournay-sur-Odon0.07 km²1% commune
- Canchy0.06 km²1% commune
- Monceaux-en-Bessin0.05 km²1% commune
- Sept-Vents0.03 km²0% commune
- Biéville-Beuville0.03 km²0% commune
- Longvillers0.02 km²0% commune
- Osmanville0.01 km²0% commune
- Périers-sur-le-Dan0.00 km²0% commune
27 intersecting protected areas
Regional Nature Park
30.78 km² overlap
Marais du Cotentin et du Bessin, Baie des Veys
IUCN Not ReportedWetland of International Importance (Ramsar Site)
7.40 km² overlap
Basses Vallées du Cotentin et Baie des Veys
IUCN Not ReportedSpecial Protection Area (Birds Directive)
6.19 km² overlap
Marais du Cotentin et du Bessin - Baie des Veys
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
6.19 km² overlap
Marais arrière-littoraux du Bessin
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.60 km² overlap
Falaise du Bessin Occidental
IUCN Not ReportedMarine Protected Area (OSPAR)
3.49 km² overlap
Falaise du Bessin Occidental
IUCN Not ReportedSpecial Protection Area (Birds Directive)
3.48 km² overlap
Anciennes carrières de la vallée de la Mue
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.98 km² overlap
Omaha beach
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.91 km² overlap
18 more protected areassorted by overlap area
Baie de Seine occidentale
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.86 km² overlap
Baie de Seine occidentale
IUCN Not ReportedMarine Protected Area (OSPAR)
1.86 km² overlap
Estuaire de l'Orne
IUCN Not ReportedSpecial Protection Area (Birds Directive)
1.73 km² overlap
Marais du Cotentin et du Bessin - Baie des Veys
IUCN Not ReportedMarine Protected Area (OSPAR)
1.20 km² overlap
Basse Vallée De La Seulles
IUCN IVBiotope Protection Order
1.15 km² overlap
Biotope Protection Order
0.36 km² overlap
Marais de ver
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.35 km² overlap
Marais de graye sur mer
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.31 km² overlap
Pointe du hoc
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.26 km² overlap
Batterie de longues
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.25 km² overlap
Mont castel
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.22 km² overlap
Estuaire de l\'orne
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.21 km² overlap
Falaise Du Cap-Romain
IUCN IIINational Nature Reserve
0.20 km² overlap
Les fonderies
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.19 km² overlap
Regional Nature Reserve
0.19 km² overlap
Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.12 km² overlap
Bassin de la Souleuvre
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.01 km² overlap
La Vire et ses affluents
IUCN IVBiotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 385 distinct species · 293 120 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de la Seulles : 12 espèces reliées par 201 interactions GloBI sur 5 types (connectance 14.6%, filtre Serrano α=0.2). 41 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
10,6°C
Annual rain
727mm
Moisture idx (CMI)
-0,01
Runoff
657mm/an
PET
736mm
AET
542mm
Mean slope
1,5°
Water table
113cm
Forest
3%
Crops
71%
Urban
7%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)